The triquetra has been found on runestones in Northern Europe and on early Germanic coins. It presumably had pagan religious meaning and it bears a resemblance to the Valknut, a symbol associated with Odin.
G Scale Trains are usually referred to as Garden Trains since they are the largest of the model trains and are used outdoors as well as indoors.
I purchased Kato's N-scale Unitrack so my son could run trains on the dining room table. We took the kinky oval design and used it as the basis for the layout my friends and I work on to build our scenery skills. (Nothing like a bunch of middle-aged armchair modellers.) We found many of the same issues reported above.